Physics
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3407104w&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 7, CiteID L07104
Physics
4
Ionosphere: Ionospheric Disturbances, Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Substorms
Scientific paper
Based on 2760 well-defined substorm onsets in the northern hemisphere and 1432 in the southern hemisphere observed by the FUV (Far Ultraviolet) Imager on board IMAGE (Imager for Magnetosphere-to-Aurora Global Exploration) spacecraft, a statistical study is performed for both hemispheres. The main emphasis is put on a possible dependence of the substorm occurrence frequency on season and longitude (S/L). It was found that around December solstice UT noon-time and around June solstice UT nighttimes are more favorable for substorms to occur. The occurrence frequency varies by a factor of 2. The sum of ionospheric Pedersen conductances of both hemispheres caused by solar illumination in the nightside auroral regions can account for the S/L dependence. Lower total conductivity seems to reduce the trigger level. We find that the IMF threshold for initiating a substorm is on average lower during favorable times, thus, substorms can occur more frequently.
Lühr Hermann
Wang Hai-Hong
No associations
LandOfFree
Seasonal-longitudinal variation of substorm occurrence frequency: Evidence for ionospheric control does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Seasonal-longitudinal variation of substorm occurrence frequency: Evidence for ionospheric control, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Seasonal-longitudinal variation of substorm occurrence frequency: Evidence for ionospheric control will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1080315